$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release.git /var/lib/mock/v8.3-incoming-10711-29263/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-incoming-10711-29263/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 26796c871a3c99d8a0b7cd6f368ad7788f8289e7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         26796c871a3c99d8a0b7cd6f368ad7788f8289e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26796c8 Merge pull request #39 from xcp-ng-rpms/pcoval/profile/review/master